Vector group of transformer

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The naming convention popularly known as Vector Group of Transformer was established by the International Electrotechnical Commission (IEC) through IEC 60076-1. This was done in order to create a notation for three-phase transformer winding configuration.

Vector Group of Transformer: Common Symbol Designation

Y or y – star winding

D or d – delta winding

N or n – neutral

0 to 12 – phase displacement in terms of clock position in multiples of 30°. 


According to the standard, the notation should follow HV-LV-Phase displacement sequence with the HV winding in uppercase and LV winding in lowercase.


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